JPH01192458A - Die casting device - Google Patents

Abstract

PURPOSE:To shorten the casting cycle and to obtain a forming product having high accuracy by making a die with a material having high heat conductivity and adjoining pushing device for pressurized-straightening to the forming product to a die clamping device. CONSTITUTION:When the molten metal is poured into cavity in the die, since the dies 8a, 8b have high heat conductivity, the molten metal is rapidly cooled and solidification is immediately started. After pouring, at the step when the surface layer of the forming product is solidified, the forming product is held with a holding device and carried to the pushing device 21 with conveying device 11. The forming product is inserted into gap between V block ends and a movable plate is shut under condition, which each block end is aligned to the bearing part in the forming product and the forming product is put between both blocks, to act the correcting load. Then, as the forming product is under red heat condition, the deformation can be corrected with relatively low load. By this method, the casting cycle is shortened and the producing efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> [Object of the Invention] The present invention relates to an apparatus for molding a cast product using a mating mold consisting of a split mold.

<Prior Art> In order to reduce the number of secondary processing steps for cast molded products, it is desirable to increase casting accuracy as much as possible. BACKGROUND ART Gravity casting, high-pressure casting, and the like, in which molten metal is injected into a cavity formed in a mating mold, are known as casting methods that can produce molded products with relatively high precision.

In casting using these molds,
As disclosed in Japanese Patent No. 2, it is common for the injected molten metal to be cooled sufficiently within the mold and then released from the mold.

<Problems to be Solved by the Invention> However, according to the above-mentioned conventional technology, the cycle time is forced to increase due to the need for cooling time within the mold, and production efficiency is forced to be sacrificed. In addition, since the molded material is sufficiently cooled in the mold, there is no deformation during mold release, but in the case of molded products made of materials with relatively poor plastic deformability, such as cast iron or cast steel, pressing Correction using devices is difficult. Therefore, it is necessary to take extra allowance for machining costs, which is disadvantageous in that the yield rate deteriorates.

In view of these problems of the prior art, the main object of the present invention is to provide a casting molding apparatus using a mold that can perform highly accurate casting molding with high efficiency.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, the purpose is to form a cast product made of cast iron material, cast steel material, etc. using a combination mold made of split molds. In this apparatus, the mold is made of a material with high thermal conductivity in order to quickly solidify the portion of the molten metal injected into the mold that contacts the inner surface of the mold, and the mold is released from the mold at a high temperature. This is achieved by providing a mold casting apparatus characterized in that a pressing device is installed adjacent to a mold clamping device to which the mold is attached to press and straighten the molded product.

<Operation> In this way, the molten metal in contact with the inner surface of the mold cavity is rapidly cooled, and a shell-like solidified layer is formed on the surface layer at an early stage, so that the molten metal is rapidly cooled before the entire cast molded product is cooled. The mold can be quickly released at this stage. In addition, after demolding,
By cooling while applying a straightening load with a pressing device,
It is possible to suppress generation of distortion in the cast molded product.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the overall layout of a casting molding apparatus to which the present invention is applied. This casting and forming apparatus has a mold clamping device 1 placed in the center, and on the left side there is a melting furnace 2 for raw metals such as cast iron or cast steel, and on the right side there are a sprue part, a runner part, etc. A cutting and discharging device 3 is provided for cutting the molded product and transporting it to the next process.

The mold clamping device 1 includes a base 4 as shown in FIG.
A fixed platen 5 fixed on the top, a plurality of tie bars 6 fixed to the fixed platen 5 and extending in the horizontal direction, and a movable platen 7 provided so as to be freely openable along the tie bars 6. have. A pair of mating molds 8a and 8b are attached to the mutually opposing inner surfaces of the fixed platen 5 and the movable platen 7, and the movable platen 7 is moved toward and away from the fixed platen 5 using a hydraulic device 9. By doing so, the molds 8a and 8b can be matched and opened.

Above the mold clamping device 1 and the cutting and dispensing device 3, a traveling rail 10 is laid along the opening and closing direction of the molds 8a and 8b, and a conveying device 11 that can run on this traveling rail 10 is installed. ing.

The conveyance device 11 is equipped with a gripping device 13 at its lower end that is moved up and down by an elevating device 12 such as a rack-pinion type, and grips the upper end of the molded product 14 taken out from the opened molds 8a and 8b. It is configured such that it can be gripped, lifted upward from the mold clamping device 1, and then automatically transferred toward the cutting and dispensing device 3 in a suspended state.

The molds 8a and 8b for casting molded products are made of a material with high thermal conductivity, such as a copper alloy, and are equipped with a cooling water passage and a heater (not shown), so that the mold temperature can be controlled. It is done like this. As shown in FIG. 3, which shows the cavity of the molded product 14, these molds 8a and 8b are used to mold four camshafts at the same time.
A runner 16 extending in the vertical direction is formed in the center part, and a runner part 17 extending in the horizontal direction is formed in the lower part,
Four product parts 18 which are to become camshafts are raised from this runner part 17 in parallel to the field 16, and furthermore, a riser part 19 is formed at the upper end of this product part 18. The lower sides of the sprue portion 15 and riser portion 19 described above are gripped by a gripping device 13.

As shown in FIG. 4, the cutting and discharging device 3 includes an electrically driven grindstone cutting device 20, a pressing device 21 that holds and fixes the molded product 14 and applies a straightening load at the same time, and a press device 21 that applies a straightening load to the molded product after cutting. and a dispensing device 22 for taking out the mold from the pressing device 21, and are arranged in series adjacent to each other along an axis parallel to the parting surface of the mold in the mold clamping device 1.

The grindstone cutting machine 20 is mounted on a slide base 24 mounted on a body frame 23, and is cut in the left-right direction in FIG. 4, that is, along the axis parallel to the parting surface of the mold. It is provided with a pair of emery disks 25 which are capable of linear sliding and have cut surfaces parallel to each other with respect to the sliding axis (FIG. 5). The emery disk 25 is pivotally supported at the free end of an arm 26 which is pivoted so as to swing vertically by hydraulic drive, for example, and is supported by an electric motor mounted on the base end side of the arm 26. 27 is driven by a belt.

Further, as a drive source for moving the slide base 24, for example, a hydraulic cylinder or an electrically driven screw device is used, and an accurate stopping position can be arbitrarily set.

As shown in FIGS. 5 and 6, the pressing device 21 is pivotally supported on the body frame 23 so as to be rotatable about an axis parallel to the parting surface of the mold, and is held at an appropriate position on the body frame 23. Pneumatic cylinder 28 supported by a trunnion
Accordingly, it is selectively rotated between a vertical position and a horizontal position.

This pressing device 21 is provided with a pair of frame plates 30 integrally and parallel to the two rotating wheels. This frame plate 30 is open at its center and is equipped with a press jig 31 inside.

The press jig 31 presses the frame plate 30 between the inner surfaces of the pair of frame plates 30.
a pair of fixed plates 32a and 32b integrally fixed with the
Both rotating plates 32a and 32 are supported by a hydraulic cylinder 33 and a guide bar 34 provided on one fixed plate 32b.
A movable plate 35 is provided which can be displaced parallel to these fixed plates between b.

On the inner surfaces of the movable plate 35 and the other fixed plate 32a that face each other, a plurality of V blocks 36 are provided with their respective ends facing each other in order to press and hold key points on the axis of the molded product 14 from the diametrical direction. It is erected.

This V block 36 is provided at a position corresponding to the bearing part of the camshaft shown by the symbol @P1... in FIG. and manufactured with high precision.

The dispensing device 22 includes a fork arm 37 that is pneumatically driven and capable of reciprocating in the left-right direction in FIG. 4. This fork arm 37 can be inserted into the press jig ° 31 through the gap between the blocks 36 held in the vertical position, and the molded product 14 is attached to the upper edge of the fork arm 37.
A recess 38 is recessed in order to receive the support.

Next, the operation procedure of the above embodiment will be explained.

When the molten metal is injected into the mold cavity, the mold 8a.
Since the thermal conductivity of 8b is extremely high, the molten metal in contact with the inner surface of the cavity is rapidly cooled and immediately starts solidifying.

After pouring, the mold is opened when the surface layer of the molded product has solidified. At this time, by operating the ejector device 39b provided on the movable platen 7 side, the mold 8 on the movable platen 7 side is opened.
Release the molded product 14 only from b, and release the mold 8a on the fixed platen 5 side.
Assume that the molded product 14 is left behind (Fig. 2).

After the mold is opened, the gripping device 13 is lowered by the lifting device 12 and moved horizontally so as to face the sprue 15 and the riser 19.

When the ejector device 39a on the fixed platen 5 side is operated in this state, the molded product 14 is extruded from the mold 8a and is gripped by the gripping device 13.

Once the molded product 14 is gripped by the gripping device 13, the lifting device 12 is raised and the molded product 14 is placed above the mold clamping device 1.
is pulled out, and the molded product 14 is transported by the transport device 11 toward the pressing device 21 .

The pressing device 21 is on standby with the movable plate 35 open and the opening surface of the frame plate 30 facing up and down (the state shown on the left side of the center line C in FIG. 4).

Here, the lifting device 12 is lowered, and the molded product 14 is inserted between the ends of the blocks 36, and the bearing portion P1 of the molded product 14 is
With the ends of each V block 36 aligned, move the movable plate 3
5 is closed, the molded product 14 is sandwiched between both V blocks 36, and a correction load is applied.

Note that this torn product 14 is in a red-hot state, and its deformation is corrected by applying a relatively low load.

After the gripping device 13 releases the molded product 14, it rises again by -L and moves backward toward the mold clamping device 1.

Next, the pressing device 21 is reversed by 90 degrees to orient the axis of the molded product 14 in the horizontal direction (to the right of the center line C in FIG. 4 and in the state shown in FIG. 5).

From this point, the grindstone cutting machine 20 is advanced, and the arm 26 is tilted downward to press the emery disk 25 against the product part 18 in order to cut the two pieces on the right side in FIG. As a result, the product portion 18 is cut along lines 1 to L2 shown in FIG.

When the cutting is completed, the emery disk 25 is returned to the upper side, the grindstone cutter 2o is returned, and the two pieces on the left are cut in the same manner as described above (FIG. 3, line L4).

At this time, the depletion part 19 is separated from the product part 18 and the chute 40 attached to the pressing device 21 and the machine frame 23
a and 40b and fall into the packet 41 placed on the side of the frame. Further, the runner part 17 and the oil port part 15 remain in the press jig 31 together with the product part 18 while being clamped by the block 36.

When all cutting is completed, the grindstone cutting machine 20 is returned to its original position, and the fork arm 37 is then inserted between the V-bron 236. When the movable plate 35 is moved downward in this state, the runner part 17 including the product part 18 and the oil port part 15 that was on the block 36 of the movable plate 35 will be moved downward.
It is transferred into the recess 38 on the fork arm 37. By moving the fork arm 37 backward, the molded product 14 that has been cut is removed from the pressing device 21.

During the series of steps described above, the molded product 14 is sufficiently cooled,
The unnecessary portions are removed by pressing with the press jig 31 without causing any distortion, and then sent to the next machining process either manually from the fork arm 37 or by a separate transfer device.

[Effects of the Invention] As described above, according to the present invention, it is possible to release the mold early after pouring the molten metal, thereby shortening the casting cycle and
This has an extremely large effect on increasing production efficiency. Moreover, since the cast molded product can be straightened with a relatively low load, high-precision molded products can be obtained without increasing equipment costs, and it is possible to reduce secondary processing costs. , which is also very effective in reducing manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram of a casting and forming apparatus to which the present invention is applied. . FIG. 2 is a side view of the mold clamping device portion. FIG. 3 is a partial end view of the mold for the molded article. FIG. 4 is a front view of the cutting and dispensing device. FIG. 5 is a side view partially cut away along line v--v in FIG. 4. FIG. 6 is a partial plan view of the pressing device. 1... Mold clamping device 2... Melting furnace 3... Cutting and discharging device 4... Base 5... Fixed plate
6...Tie bar 7...Movable plate 8a/8b
...Matching mold 9...Hydraulic device 10...Traveling rail 11...Transfer device 12...Elevating device 13...Gripping device 14...Molded product 15...
Sprue part 16... Runway 17... Runner part
18...Product section 19...Rising water section 20...
- Grindstone cutting machine 21... Pressing device 22... Dispensing device 23... Separate frame 24... Slide base 25... Emery disk 26... Arm 27... Electric motor 28...
Pneumatic cylinder 29...Rotation shaft 30...Frame plate
31...Press jig 32a, 32b...Fixing plate 33...Hydraulic cylinder 34...Guide bar 35...
...Movable plate 36...■Block 37...Fork arm 38...Indentation 39a, 39b...Ejector device 40a, 40b...Chute 41...Packet

Claims (1)

[Claims] (1) A device for forming a cast product made of cast iron or cast steel using a combination mold consisting of split molds, in which the portion of the molten metal injected into the mold that comes into contact with the inner surface of the mold is The mold is made of a material with high thermal conductivity so as to solidify quickly, and a pressing device is installed adjacent to a mold clamping device to which the mold is attached to press and straighten the molded product released from the mold at high temperature. A mold casting device characterized by: